#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    int H = 0, W = 0;
    string s;
    cin >> s;

    rep(i,s.size()){
        if(s[i]=='S')
            --H;
        else if(s[i]=='N')
            ++H;
        else if(s[i]=='W')
            --W;
        else
            ++W;
    }

    printf("%.5f\n", sqrt(H * H + W * W));

    return 0;
}